The module for assimilating radiance data of the Microwave Humidity Sounder-2 (MWHS-2) onboard Feng Yun 3D (FY-3D) satellite is built in Weather Research and Forecasting (WRF) model assimilation (WRFDA) system. CONV, 3DVar, EnVar experiments are conducted to investigate impact new humidity sounder based on Typhoon Ampil (2018). Both 3DVar assimilate FY-3D MWHS-2 top conventional data, while CON...

[1] An extended Tracking Radar Echo by Correlation (TREC) technique, called T-TREC technique, has been developed recently to retrieve horizontal circulations within tropical cyclones (TCs) from single Doppler radar reflectivity (Z) and radial velocity (Vr, when available) data. This study explores, for the first time, the assimilation of T-TREC-retrieved winds for a landfalling typhoon, Meranti...

A Space and Time Mesoscale Analysis System (STMAS) has been developed at Forecast Systems Laboratory (FSL) to generate a gridded analysis of surface observations. It is a three-dimensional variational analysis (3DVAR) of horizontal space and time instead of pressure or height levels. It is used to detect boundary layer phenomena, frontal zones, and various nonlinear phenomena, and has been used...

A diagnostic pressure equation is incorporated into a storm-scale three-dimensional variational (3DVAR) data assimilation system in the form of a weak constraint in addition to a mass continuity equation constraint (MCEC). The goal of this diagnostic pressure equation constraint (DPEC) is to couple different model variables to help build a more dynamic consistent analysis and therefore improve ...

Title of dissertation: ENSEMBLE KALMAN FILTER EXPERIMENTS WITH A PRIMITIVE-EQUATION GLOBAL MODEL Takemasa Miyoshi, Doctor of Philosophy, 2005 Dissertation directed by: Professor Eugenia Kalnay Department of Meteorology The ultimate goal is to develop a path towards an operational ensemble Kalman filtering (EnKF) system. Several approaches to EnKF for atmospheric systems have been proposed but n...

An observing system simulation experiment (OSSE) has been carried out to evaluate the 1 impact of a hybrid ensemble-variational data assimilation algorithm for use with the National 2 Centers for Environmental Prediction (NCEP) global data assimilation system. An OSSE 3 provides a controlled framework for evaluating analysis and forecast errors since a truth is 4 known. In this case, the nature...

[1] The impact of radar data on the analysis and prediction of the structure, intensity, and track of landfalling Hurricane Ike (2008), at a cloud-resolving resolution, is examined. Radial velocity (Vr) and reflectivity (Z) data from coastal radars are assimilated over a 6-h period before Ike landfall, using the ARPS 3DVAR and cloud analysis package through 30-min assimilation cycles. Eighteen-...

Assimilation of the Moderate Resolution Imaging Spectroradiometer (MODIS) total aerosol optical depth (AOD) retrieval products (at 550 nm wavelength) from both Terra and Aqua satellites have been developed within the National Centers for Environmental Prediction (NCEP) Gridpoint Statistical Interpolation (GSI) three-dimensional variational (3DVAR) data assimilation system. This newly developed ...

Météo-France is currently developing a Numerical Weather Prediction (NWP) system at convective scale that will be hopefully run operationally at the beginning of 2008. This system, called AROME, will cover the French territory with a 2.5 km horizontal resolution and will use a complete data assimilation system derived from the ALADIN 3Dvar that is operationally running at Météo-France at region...